ABET-based program outcomes are the skills and knowledge that a student successfully completing the program has obtained at the time of graduation. For a Computer Science program, many of these outcomes require a developmental progression of learning experiences that are best provided incrementally across courses. Achievement of such a progression is predicated on a cooperative effort by faculty to define effective approaches to realizing the outcomes. However, the progression must also minimize demands on individual courses and eliminate unnecessary restrictions on faculty discretion in course design and implementation. In addition, a time-phased assessment plan should be overlaid upon the progression to measure and track the developmental process. This work documents our effort to define a developmental progression in our computer science program to better achieve ABET-based outcomes, integrate the progression into an existing curriculum in a minimally invasive manner, and incrementally assess the effectiveness of the approach.